
The AS configuration scheme operation is like earlier device families. However, there is one significant difference. Intel Agilex
devices using AS mode, try to load a firmware section from addresses 0, 512, 1024 and 1536 in the serial flash device
connected to the CS0 pin.
If the configuration bitstream does not include a valid image, the SDM asserts an error by driving
nSTATUS
low. You can
recover from the error by reconfiguring the FPGA over JTAG, or by driving
nCONFIG
low.
SDM tristates AS pins,
AS_CLK
,
AS_DATA0
-
AS_DATA3
, and
AS_nCS0
-
AS_nCS3
, only when the device powers on if you set
MSEL
to JTAG. If
MSEL
is either AS fast or normal, the SDM drives the AS pins until you power cycle the Intel Agilex device.
Unlike earlier device families, the AS pins are not tristated when the device enters user mode.
The AS configuration scheme has power-on requirements. If you use AS Fast mode and are not concerned about 100 ms PCIe
link training requirement, you must still ramp the V
CCIO_SDM
supply within 18 ms. This ramp-up requirement ensures that the
AS x4 device is within its operating voltage range when the Intel Agilex device begins assessing the AS x4 device.
When using AS fast mode, all power supplies to the Intel Agilex device must be fully ramped-up to the recommended
operating conditions before the SDM releases from reset. To meet the PCIe 100 ms power-up-to-active time requirement for
CvP, the V
CCIO_SDM
power to the Intel Agilex device must be at the recommended operating range within 10 ms.
Debugging Suggestions
Here are some debugging tips for the AS configuration scheme:
•
Ensure that the boot address for your configuration image is correctly defined when generating the programming file for
the flash. The boot address defaults to 0 for AS configuration.
•
Ensure that the design meets the power-supply ramp requirements for fast AS mode. If using fast mode, V
CCIO_SDM
must
ramp up within 18 ms.
•
Ensure that the flash is powered up and ready to be accessed when the Intel Agilex device exits power-on reset.
•
If you are using an external clock source for configuration, ensure the
OSC_CLK_1
pin is fed correctly, and the frequency
matches the frequency you set for the
OSC_CLK_1
in your Intel Quartus Prime Pro Edition project.
•
Ensure the
MSEL
pins reflect the correct AS configuration scheme.
3. Intel Agilex Configuration Schemes
UG-20205 | 2019.10.09
Intel
®
Agilex
™
Configuration User Guide
107
Содержание Agilex
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